OPTICAL FILM AND POLARIZING FILM USING THE SAME, AND METHOD FOR IMPROVING VIEW ANGLE OF THE POLARIZING FILM

摘要

The invention provides an optical film prepared by laminating at least one of a first retardation film (2), having a mean in-plane refractive index of no and refractive index in the thickness direction of n e wherein n e - n o > 0, and at least one of a second retardation film (3) having an in-plane refractive index of n x in the direction showing the maximum refractive index, refractive index of n y in the direction perpendicular to the direction described just before, and refractive index in the thickness direction of n z wherein n x > n y .gtoreq. n z. The light leakage occurred as the observation point is tilted from the front direction to a direction different from the direction of each absorption axis can be reduced when a plolarizing film is arranged so that the absorption axes will be perpendicular to each other.